Lecture 7 - LGOs Ligand Group Orbitals LGOs b u σ 1 b g 1...

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1 Chem 172 Advanced Inorganic Chemistry Lecture 7 Molecular Orbital Theory Continue lecture 6 and simple polyatomic molecules Polyatomic Molecules Molecular orbital theory can be used to describe electronic structure of systems of multiple atoms from 3 to infinite number of atoms (solid), in a way very similar to diatomic molecules. MOs are formed by linear combination of AOs of same symmetry. The degree of interaction depending on the relative energy match between AOs and distance (interaction between non- nearest neighbor are weaker than nearest neighbors). N AOs combine to form N MOs. Ligand Group Orbitals AXn Ligand group orbitals: collection of matching orbitals on ligand (X) atoms. In AX2, group orbitals are the same combination that formed bonding and antibonding orbitals in diatomic molecules, but they are now separated by the central atom and at larger distance with weaker interaction. Example: FHF - Example: FHF - Ligand Group Orbitals
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